Samson 3374 - Replacing the Actuator; Replacing the Seat and Plug; Replacing the Actuators Operating Diaphragm

9-8 EB 3018 EN
Servicing
9.3.1 Replacing the actuator
Î See Fig.9-1 and Fig.9-2
Read the mounting and operating instruc-
tions of actuators with fail-safe action (see
documents listed under 'Referenced docu-
mentation' in the 'Safety instructions and
measures' section).
Removing the actuator
1. Put the regulator out of operation (see
the 'Decommissioning' section).
2. Unscrew the control line (18) at the con-
trol line connection (19).
3. Unscrew the coupling nut (11) of the dia-
phragm actuator from the valve. Remove
the actuator.
Mounting the actuator
1. Place the diaphragm actuator on the
valve and fasten tight the coupling nut
(11). Observe the specied tightening
torques (see 'Tightening torques' in An-
nex).
2. Screw the control line (18) to the control
line connection (19) on the valve and ac-
tuator. Observe the specied tightening
torques (see 'Tightening torques' in An-
nex).
Note
3. Put the regulator back into operation (see
the 'Start-up' section).
9.3.2 Replacing the seat and
plug
To replace seat and plug, contact
SAMSON's After-sales Service.
Further information is available in Annex
('After-sales service').
9.3.3 Replacing the actuator's
operating diaphragm
The associated order number is written on
the actual operating diaphragm.
Î See Fig.9-1 and Fig.9-2
Removing the operating diaphragm
1. Put the regulator out of operation (see
the 'Decommissioning' section).
2. Unscrew the control line (18) at the con-
trol line connection (19).
3. Unscrew the coupling nut (11) of the dia-
phragm actuator from the valve. Remove
the actuator.
4. Clamp the coupling nut (11) into a suit-
able xture.
5. Unscrew nuts and bolts (15) from the ac-
tuator. Remove the actuator case.
6. Unscrew the diaphragm plate nut (17)
and remove the operating diaphragm
(12) from the diaphragm plate (16).
Tip